Thermopane windows are usually made with two layers of glass separated by an air space explain why answers

the air space is there for a reason. once the material changes its normal lenght, it probably will need space. this is due to temperature, also know as specific heat capacity The air space causes the window to transfer less heat. Glass is a relatively good medium for conducting heat, while air is a poor conductor. With single paned windows, heat can easily flow from the inside of your house to the outside environment, wasting energy. However, since air is a poor conductor, heat does not transfer as well through thermopane windows.

answer: when the substance contain the two parts (polar and non-polar) like soap.

explanation:

soap is produced from the basic hydrolysis of ester "saponification", it is considered as a salt of hydrocarbons. the soap molecule contains the two parts: a polar group   (-coo-na+) and a non-polar group (r-hydrocarbon part). the polar group is called the head and the tail is the non-polar group. the polar group is hydrophilic in nature (water loving) and the non-polar group is hydrophobic in nature (water repelling).the polar/non-polar nature of a substance is useful that it can dissolve the non-polar substances by the polar part and also can dissolve the polar substances by the non-polar part. it commonly used in detergents and soaps.

Malware, not sure what else would fit that description.